A modular monument assembly configured to be positioned in an aircraft that includes an enclosure that includes a first module and a second module, and a circulation system that is adapted to receive water from a water source. The circulation system includes a circulation line for circulating water, a water heater, a circulation pump, first and second faucets and first and second lines that are in fluid communication with the first and second faucets. The first faucet is positioned in the first module and the second faucet is positioned in the second module.